They are suitable for all internal wooden door types that only require a Door latch mechanism for opening and closing. Designed for effectiveness, and built to last, these door handles for internal doors add class and style to any interior door as they are universally appealing and aesthetically pleasing. The sliding mechanism is fitted with a nylon seal to enable smooth movement and the handle returns to the horizontal position due to the spring mechanism. This Bath Lock door handle is supplied on a backplate for standard internal doors and includes a 2.5" mortice bath lock. All the necessary fixtures are supplied including the fixing screws and internal tubular bar and thumb turn. Installing these handles is easy, you only need to use 4 screws each side. The dimensions of the backplate are approximately 167mm x 51mm, the Scroll handle is approx 107mm with a good solid thickness that just by looking at it says QUALITY. Size / Dimensions Size: 167mm x 51mm Backplate Dimensions: 167mm x 51mm Backplate Projection: 10mm Overall Projection: 58mm Handle Length: 107mm Spindle Width: 7.9mm